I'm Looking for Immortality in Troubled Times

Jiang Yunyi traveled to the troubled times of ancient times with the Secret of Immortality and became a young doctor in a slum outside the city. In this era of turmoil, natural disasters, rampant sects, and various princes vying for hegemony in the world, although Jiang Yunyi has an immortality system, the first thing he has to consider is how to survive...